diff --git a/Source/Python/utils/mp4-hls.py b/Source/Python/utils/mp4-hls.py
old mode 100644
new mode 100755
diff --git a/Source/Python/wrappers/mp4dash b/Source/Python/wrappers/mp4dash
index f9e5f206d..241d5858e 100755
--- a/Source/Python/wrappers/mp4dash
+++ b/Source/Python/wrappers/mp4dash
@@ -1,3 +1,3 @@
-#! /bin/bash
-BASEDIR=$(dirname $0)
-exec python "$BASEDIR/../utils/mp4-dash.py" "$@"
+#!/usr/bin/env python
+import os,sys
+os.execv(os.path.dirname(os.path.realpath(sys.argv[0])) + "/../utils/mp4-dash.py", sys.argv)
diff --git a/Source/Python/wrappers/mp4dashclone b/Source/Python/wrappers/mp4dashclone
index 4d1bd65bb..671579345 100755
--- a/Source/Python/wrappers/mp4dashclone
+++ b/Source/Python/wrappers/mp4dashclone
@@ -1,3 +1,3 @@
-#! /bin/bash
-BASEDIR=$(dirname $0)
-exec python "$BASEDIR/../utils/mp4-dash-clone.py" "$@"
+#!/usr/bin/env python
+import os,sys
+os.execv(os.path.dirname(os.path.realpath(sys.argv[0])) + "/../utils/mp4-dash-clone.py", sys.argv)
diff --git a/Source/Python/wrappers/mp4hls b/Source/Python/wrappers/mp4hls
index a320dd113..ec6c88444 100755
--- a/Source/Python/wrappers/mp4hls
+++ b/Source/Python/wrappers/mp4hls
@@ -1,3 +1,3 @@
-#! /bin/bash
-BASEDIR=$(dirname $0)
-exec python "$BASEDIR/../utils/mp4-hls.py" "$@"
+#!/usr/bin/env python
+import os,sys
+os.execv(os.path.dirname(os.path.realpath(sys.argv[0])) + "/../utils/mp4-hls.py", sys.argv)